this is all taking place in the tiny town of mount coal, west virginia. joining us live with the latest on this ongoing search, katherine? >> hi anita, this afternoon,crews installed them in the holes that they have been drilling for the past couple of days. they are in the process now of trying to ventilate this mine, trying to air out some of the poisonous gases. under the ideal conditions if nothing going wrong, they will be able to get in about 6:00 tonight. >> reporter: rescuers waiting outside the upper big branch mine are anxious to get back to ground. >> this is still a rescue mission to us. we still have rescue chambers that we have to go to. and we still believe. >> reporter: this morning, they got close to where four missing miners might be located. when explosive levels of the toxic gas forced them to evacuate. >> as you can imagine, hauling equipment for the long distance, getting out there, getting exactly where you need to be. and then happens to double time and back out because you find yourself in harm's way. >> reporter: crews are workin